Knife-grinder for mowing-machines



(ModeL) J. W. WAT$ON. KNIFE GRINDER FOR MOWING MACHINES.

PatentedMar. 15, 1892..

UNITED STATES PATENT OFFICE.

JAMES W. WATSON, or ACHOR, or-no.

KNIFE-GRINDER FOR MCWING-MACHINES.

SPECIFICATION forming part of Letters Patent No; 470,905, dated March 15, 1892.

Application filed January 17, 1891. SerialNo. 378,088.

To all whom it may concern.-

Be it known that I, JAMES W. WATSON, a citizen of the United States, residing at Achor, in the county of Oolumbiana and State of Ohio, have invented certain new and useful Improvements in Knife-Grinders for Mowing- Machines, of which the following, with the accompanying drawings, is a specification.

This invention relates to certain new and useful improvements in knife-grinders for mowing-machines, and is especially designed as an improvement upon the device described and claimed in my application for a similar device, Serial No. 343,009.

The object of the invention is to-provide improved means for securing the bars which carry the grinders to the finger-bar.

The invention consists in the peculiar construction, arrangement, and combinations of the Various parts, all as more fully hereinafter described and claimed.

Figure 1 is a side elevation of one of the guard-fingers of amowing-machine and showing my device attached thereto in sectional elevation, with grinders in elevated position. Fig. 2 is a similar view with the grinders lowered to the work upon the knife-section. Fig. 3 is an enlarged perspective of a portion of the grinder-bars carrying adjustable keepers. Fig. 4 is a similar view showing manner of securing together meeting ends of the grind er-bars. Fig. 5 represents the lock-keeper. Fig. 6 is a View of the supplemental extension of the clamp-bar for securingthe grinderbarin place, and Fig. 7 is a view of the lock rod or bar.

In the accompanying drawings, which form a part of this specification,AA are two bars hinged together by the hinge B, so that the upper barAmay have a rocking motion upon the lower bar A.

The bars A and A may be made in sections, as shown in Fig. I, if desired, so that they may be lengthened or shortened to fit different lengths of finger-bars. WVhen so made in sections, the abutting ends are secured together "by the keeper-bands O, which are secured to the bars by proper thumbscrews D.

In the rear face of the lower bar A is formed a groove a, and around the bar is placed a series of keeper-bands F, each of which is pro-.

(ModeL) vided with a hole a, coincident with the groove a, and these bands F are provided with thumb-screws G, by means of which they may be secured the desired distance apart upon the said bar A, so as to receive the points of the guard-fingers E of the machine, as is' clearly shown in the drawings.

H isa clamp bar or rod, the rear end of which is provided with an elongated slot to passes through said slot and engages with the rear side or edge of the finger-bar J. This bolt I is secured in place by a wing-nut K, which clamps a washer L into engagement receive the L-shaped clamp-bolt I; which with the upper face of the clamp rod or bar H. The forward end of the bar H is provided with a pivoted supplemental extension H, which is provided with a lip H". The part II passes between the bars A andA' and is cut out at H' to fit around the adjacent.

keeper F, while its lip extends down upon the outer face of the lower bar 'A and is retained in place by the thumb-screw Gr. Two or more clamps may be employed, as may be desired, for securing the grinder-bars upon the guardfingers of the machine.

M represents the abrasive or grinding blocks, made of any suitable material to accomplish the purpose for which they are designed.

Each block is preferably larger at one end than at the other and has its opposite grinding-faces beveled laterally both ways from its center line.

N are the grinder-block springs or holders, by means of which the blocks are attached to the rock-bar A and secured to adjusted position by the thumb-screws 0. Each of the blocks M has a bolt passing through its longitudinal center, which bolts are also designed to engage with the adjacent ends of the springholders N. Nuts M" upon the ends of the bolts are adapted to secure the blocks in any desired vertical adjustment between the branches of the spring-holders N, as shown, and to adjust them to the angle of the section of knife-bar to be ground.

P is a lock rod or bar. In its lower end is formed a hole, bymeans of which it is secured to the lower bar A and keeper F by the thumbscrew G. A series of holes are made in the lock-bar, which are adapted to engage with a pin R, projecting from the center of the upper bar A. When engaged with the lower hole of the series of holes just mentioned, the grinding-block will be retained in its elevated position, as shown in Fig. 1, and away from contact with the knife.

S is a lock-keeper, which is L-shaped and is slotted at one end to slip over the upper end of the lock-bar and rest upon and embrace the upper bar A. By raising the lock-keeper the weight of the upper bar and the grindingblocks will be sufficient to let the latter fall down upon the sections of the knife. Should there be any one or more of the knife-sections that require more grinding than the others, the heel of the abrasive block over that sec tion is dropped by loosening the thumb-nuts M" for that purpose.

By this construction and arrangement of parts it will readily be seen that the device can be quickly adjusted to any mowing-ma chine and that the grinderor abrasive blocks can readily be adjusted to meet the requirement of each section of the knife. It will also be readily understood that by means of the pivotal connection between the clamp-rod Hand its supplemental extension II the clamp may be accommodated to different positions of the guard-finger keepers with respect to the position of the clamping-bolt. It will also be readily observed that the device can be adjusted upon machines of different makes, as the parts are all substantially adjustable in the longitudinal direction'of the cutter-bar, so as to engage with the points of the fingerguards of all the standard makes now upon the market.

If it is desired, the device may be constructed in longitudinal sections or halves, and in such case but half of the knife-sections can be ground at a time.

What I claim as my invention is- 1. In a knife-grinder for mowing-machines, the combination of the bar A, having knifegrinders connected therewith, guard-finger keepers adjustable longitudinally on said bar, substantially as shown and described, and means for securing the bar and keepers in place.

2. In a knife-grinder for mowing-machines, the combination of the bar A, having knifegrinders connected therewith, the said bar having the groove a, the guard-finger keepers adjustable longitudinally on said bar, the said keepers having holes a. coincident with the groove a, the hole and groove being adapted to receive the end of the guard-fingers, substantially as shown and described, and means for securing the bar and keepers in place.

3. In a knife-grinder for mowing-machines,

the combination of the bar A, the guard-fin ger keeper F, adjustable longitudinally on said bar, the clamp bar or rod composed of two sections H and II, pivoted together, the said clamp-bar connected at one end with the keeper and the other end constructed to be clamped or bolted adj ustably to the fi nger-bar, substantially as shown, and for the purpose described.

In testimony whereof I affix my sign ature,in presence of two witnesses, this 16th day of May, 1890.

JAMES \V. \VATSON.

Witnesses:

GUSTAVUS II. HUFF, RICHARD F. RANDOLPH. 

